sys_pipe.c File Reference

#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/filio.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/ttycom.h>
#include <sys/stat.h>
#include <sys/malloc.h>
#include <sys/poll.h>
#include <sys/selinfo.h>
#include <sys/signalvar.h>
#include <sys/syscallsubr.h>
#include <sys/sysctl.h>
#include <sys/sysproto.h>
#include <sys/pipe.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/uio.h>
#include <sys/user.h>
#include <sys/event.h>
#include <security/mac/mac_framework.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_object.h>
#include <vm/vm_kern.h>
#include <vm/vm_extern.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/vm_page.h>
#include <vm/uma.h>

Include dependency graph for sys_pipe.c:

Go to the source code of this file.

Macros
#define	PIPE_PEER(pipe)    (((pipe)->pipe_type & PIPE_TYPE_NAMED) ? (pipe) : ((pipe)->pipe_peer))
#define	MINPIPESIZE   (PIPE_SIZE/3)
#define	MAXPIPESIZE   (2*PIPE_SIZE/3)

Functions
	__FBSDID ("$FreeBSD$")
static void	filt_pipedetach (struct knote *kn)
static void	filt_pipedetach_notsup (struct knote *kn)
static int	filt_pipenotsup (struct knote *kn, long hint)
static int	filt_piperead (struct knote *kn, long hint)
static int	filt_pipewrite (struct knote *kn, long hint)
	SYSCTL_LONG (_kern_ipc, OID_AUTO, maxpipekva, CTLFLAG_RDTUN|CTLFLAG_NOFETCH, &maxpipekva, 0, "Pipe KVA limit")
	SYSCTL_LONG (_kern_ipc, OID_AUTO, pipekva, CTLFLAG_RD, &amountpipekva, 0, "Pipe KVA usage")
	SYSCTL_INT (_kern_ipc, OID_AUTO, pipefragretry, CTLFLAG_RD, &pipefragretry, 0, "Pipe allocation retries due to fragmentation")
	SYSCTL_INT (_kern_ipc, OID_AUTO, pipeallocfail, CTLFLAG_RD, &pipeallocfail, 0, "Pipe allocation failures")
	SYSCTL_INT (_kern_ipc, OID_AUTO, piperesizefail, CTLFLAG_RD, &piperesizefail, 0, "Pipe resize failures")
	SYSCTL_INT (_kern_ipc, OID_AUTO, piperesizeallowed, CTLFLAG_RW, &piperesizeallowed, 0, "Pipe resizing allowed")
static void	pipeinit (void *dummy __unused)
static void	pipeclose (struct pipe *cpipe)
static void	pipe_free_kmem (struct pipe *cpipe)
static int	pipe_create (struct pipe *pipe, bool backing)
static int	pipe_paircreate (struct thread *td, struct pipepair **p_pp)
static __inline int	pipelock (struct pipe *cpipe, int catch)
static __inline void	pipeunlock (struct pipe *cpipe)
static void	pipe_timestamp (struct timespec *tsp)
static int	pipe_build_write_buffer (struct pipe *wpipe, struct uio *uio)
static void	pipe_destroy_write_buffer (struct pipe *wpipe)
static int	pipe_direct_write (struct pipe *wpipe, struct uio *uio)
static void	pipe_clone_write_buffer (struct pipe *wpipe)
static int	pipespace (struct pipe *cpipe, int size)
static int	pipespace_new (struct pipe *cpipe, int size)
static int	pipe_zone_ctor (void *mem, int size, void *arg, int flags)
static int	pipe_zone_init (void *mem, int size, int flags)
static void	pipe_zone_fini (void *mem, int size)
	SYSINIT (vfs, SI_SUB_VFS, SI_ORDER_ANY, pipeinit, NULL)
static int	sysctl_handle_pipe_mindirect (SYSCTL_HANDLER_ARGS)
	SYSCTL_OID (_kern_ipc, OID_AUTO, pipe_mindirect, CTLTYPE_LONG|CTLFLAG_RW, &pipe_mindirect, 0, sysctl_handle_pipe_mindirect, "L", "Minimum write size triggering VM optimization")
int	pipe_named_ctor (struct pipe **ppipe, struct thread *td)
void	pipe_dtor (struct pipe *dpipe)
int	kern_pipe (struct thread *td, int fildes[2], int flags, struct filecaps *fcaps1, struct filecaps *fcaps2)
int	sys_pipe2 (struct thread *td, struct pipe2_args *uap)
void	pipeselwakeup (struct pipe *cpipe)
static int	pipe_read (struct file *fp, struct uio *uio, struct ucred *active_cred, int flags, struct thread *td)
static int	pipe_write (struct file *fp, struct uio *uio, struct ucred *active_cred, int flags, struct thread *td)
static int	pipe_truncate (struct file *fp, off_t length, struct ucred *active_cred, struct thread *td)
static int	pipe_ioctl (struct file *fp, u_long cmd, void *data, struct ucred *active_cred, struct thread *td)
static int	pipe_poll (struct file *fp, int events, struct ucred *active_cred, struct thread *td)
static int	pipe_stat (struct file *fp, struct stat *ub, struct ucred *active_cred)
static int	pipe_close (struct file *fp, struct thread *td)
static int	pipe_chmod (struct file *fp, mode_t mode, struct ucred *active_cred, struct thread *td)
static int	pipe_chown (struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred, struct thread *td)
static int	pipe_fill_kinfo (struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
static int	pipe_kqfilter (struct file *fp, struct knote *kn)

Variables
static fo_rdwr_t	pipe_read
static fo_rdwr_t	pipe_write
static fo_truncate_t	pipe_truncate
static fo_ioctl_t	pipe_ioctl
static fo_poll_t	pipe_poll
static fo_kqfilter_t	pipe_kqfilter
static fo_stat_t	pipe_stat
static fo_close_t	pipe_close
static fo_chmod_t	pipe_chmod
static fo_chown_t	pipe_chown
static fo_fill_kinfo_t	pipe_fill_kinfo
struct fileops	pipeops
static struct filterops	pipe_nfiltops
static struct filterops	pipe_rfiltops
static struct filterops	pipe_wfiltops
static long	amountpipekva
static int	pipefragretry
static int	pipeallocfail
static int	piperesizefail
static int	piperesizeallowed = 1
static long	pipe_mindirect = PIPE_MINDIRECT
static uma_zone_t	pipe_zone
static struct unrhdr64	pipeino_unr
static dev_t	pipedev_ino

Macro Definition Documentation

MAXPIPESIZE

#define MAXPIPESIZE   (2*PIPE_SIZE/3)

Definition at line 205 of file sys_pipe.c.

MINPIPESIZE

#define MINPIPESIZE   (PIPE_SIZE/3)

Definition at line 204 of file sys_pipe.c.

PIPE_PEER

#define PIPE_PEER

(

pipe

)

(((pipe)->pipe_type & PIPE_TYPE_NAMED) ? (pipe) : ((pipe)->pipe_peer))

Definition at line 142 of file sys_pipe.c.

Function Documentation

__FBSDID()

__FBSDID

(

"$FreeBSD$"

)

filt_pipedetach()

static void filt_pipedetach ( struct knote *  kn )

static

Definition at line 1769 of file sys_pipe.c.

References knlist_remove().

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filt_pipedetach_notsup()

static void filt_pipedetach_notsup ( struct knote *  kn )

static

Definition at line 1834 of file sys_pipe.c.

filt_pipenotsup()

static int filt_pipenotsup ( struct knote *  kn, long  hint  )

static

Definition at line 1840 of file sys_pipe.c.

filt_piperead()

static int filt_piperead ( struct knote *  kn, long  hint  )

static

Definition at line 1780 of file sys_pipe.c.

filt_pipewrite()

static int filt_pipewrite ( struct knote *  kn, long  hint  )

static

Definition at line 1802 of file sys_pipe.c.

kern_pipe()

int kern_pipe	(	struct thread *	td,
		int	fildes[2],
		int	flags,
		struct filecaps *	fcaps1,
		struct filecaps *	fcaps2
	)

Definition at line 469 of file sys_pipe.c.

References falloc_caps(), fd, fdclose(), finit(), flags, pipe_paircreate(), pipeclose(), and pipeops.

Referenced by sys_pipe2().

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pipe_build_write_buffer()

static int pipe_build_write_buffer ( struct pipe *  wpipe, struct uio *  uio  )

static

Definition at line 896 of file sys_pipe.c.

Referenced by pipe_direct_write().

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pipe_chmod()

static int pipe_chmod ( struct file *  fp, mode_t  mode, struct ucred *  active_cred, struct thread *  td  )

static

Definition at line 1577 of file sys_pipe.c.

References invfo_chmod(), mode, and vn_chmod().

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pipe_chown()

static int pipe_chown ( struct file *  fp, uid_t  uid, gid_t  gid, struct ucred *  active_cred, struct thread *  td  )

static

Definition at line 1591 of file sys_pipe.c.

References invfo_chown(), and vn_chown().

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pipe_clone_write_buffer()

static void pipe_clone_write_buffer ( struct pipe *  wpipe )

static

Definition at line 961 of file sys_pipe.c.

References pipe_destroy_write_buffer().

Referenced by pipe_direct_write().

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pipe_close()

static int pipe_close ( struct file *  fp, struct thread *  td  )

static

Definition at line 1565 of file sys_pipe.c.

References badfileops, pipe_dtor(), and vnops.

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pipe_create()

static int pipe_create ( struct pipe *  pipe, bool  backing  )

static

Definition at line 703 of file sys_pipe.c.

References amountpipekva, maxpipekva, pipeino_unr, and pipespace_new().

Referenced by pipe_paircreate().

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pipe_destroy_write_buffer()

static void pipe_destroy_write_buffer ( struct pipe *  wpipe )

static

Definition at line 941 of file sys_pipe.c.

Referenced by pipe_clone_write_buffer(), and pipe_direct_write().

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pipe_direct_write()

static int pipe_direct_write ( struct pipe *  wpipe, struct uio *  uio  )

static

Definition at line 1003 of file sys_pipe.c.

References pipe_build_write_buffer(), pipe_clone_write_buffer(), pipe_destroy_write_buffer(), pipelock(), pipeselwakeup(), pipeunlock(), and wakeup().

Referenced by pipe_write().

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pipe_dtor()

void pipe_dtor

(

struct pipe *

dpipe

)

Definition at line 437 of file sys_pipe.c.

References funsetown(), and pipeclose().

Referenced by pipe_close().

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pipe_fill_kinfo()

static int pipe_fill_kinfo ( struct file *  fp, struct kinfo_file *  kif, struct filedesc *  fdp  )

static

Definition at line 1606 of file sys_pipe.c.

References vn_fill_kinfo().

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pipe_free_kmem()

static void pipe_free_kmem ( struct pipe *  cpipe )

static

Definition at line 1621 of file sys_pipe.c.

References amountpipekva.

Referenced by pipe_paircreate(), pipeclose(), and pipespace_new().

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pipe_ioctl()

static int pipe_ioctl ( struct file *  fp, u_long  cmd, void *  data, struct ucred *  active_cred, struct thread *  td  )

static

Definition at line 1369 of file sys_pipe.c.

References data, fgetown(), and fsetown().

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pipe_kqfilter()

static int pipe_kqfilter ( struct file *  fp, struct knote *  kn  )

static

Definition at line 1721 of file sys_pipe.c.

References knlist_add(), pipe_nfiltops, PIPE_PEER, pipe_rfiltops, pipe_wfiltops, and vnops.

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pipe_named_ctor()

int pipe_named_ctor	(	struct pipe **	ppipe,
		struct thread *	td
	)

Definition at line 423 of file sys_pipe.c.

References pipe_paircreate().

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pipe_paircreate()

static int pipe_paircreate ( struct thread *  td, struct pipepair **  p_pp  )

static

Definition at line 364 of file sys_pipe.c.

References knlist_destroy(), knlist_init_mtx(), pipe_create(), pipe_free_kmem(), and pipe_zone.

Referenced by kern_pipe(), and pipe_named_ctor().

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pipe_poll()

static int pipe_poll ( struct file *  fp, int  events, struct ucred *  active_cred, struct thread *  td  )

static

Definition at line 1440 of file sys_pipe.c.

References PIPE_PEER, and selrecord().

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pipe_read()

static int pipe_read ( struct file *  fp, struct uio *  uio, struct ucred *  active_cred, int  flags, struct thread *  td  )

static

Definition at line 716 of file sys_pipe.c.

References amountpipekva, maxpipekva, MINPIPESIZE, pipe_timestamp(), pipelock(), piperesizeallowed, pipeselwakeup(), pipespace(), pipeunlock(), uiomove(), and wakeup().

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pipe_stat()

static int pipe_stat ( struct file *  fp, struct stat *  ub, struct ucred *  active_cred  )

static

Definition at line 1518 of file sys_pipe.c.

References pipedev_ino, and vnops.

pipe_timestamp()

static void pipe_timestamp ( struct timespec *  tsp )

static

Definition at line 458 of file sys_pipe.c.

References getnanotime().

Referenced by pipe_read(), pipe_write(), and pipe_zone_ctor().

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pipe_truncate()

static int pipe_truncate ( struct file *  fp, off_t  length, struct ucred *  active_cred, struct thread *  td  )

static

Definition at line 1351 of file sys_pipe.c.

References invfo_truncate(), and vnops.

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pipe_write()

static int pipe_write ( struct file *  fp, struct uio *  uio, struct ucred *  active_cred, int  flags, struct thread *  td  )

static

Definition at line 1086 of file sys_pipe.c.

References amountpipekva, maxpipekva, pipe_direct_write(), pipe_mindirect, PIPE_PEER, pipe_timestamp(), pipelock(), piperesizeallowed, pipeselwakeup(), pipespace(), pipeunlock(), uiomove(), and wakeup().

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pipe_zone_ctor()

static int pipe_zone_ctor ( void *  mem, int  size, void *  arg, int  flags  )

static

Definition at line 291 of file sys_pipe.c.

References pipe_timestamp().

Referenced by pipeinit().

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pipe_zone_fini()

static void pipe_zone_fini ( void *  mem, int  size  )

static

Definition at line 352 of file sys_pipe.c.

Referenced by pipeinit().

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pipe_zone_init()

static int pipe_zone_init ( void *  mem, int  size, int  flags  )

static

Definition at line 339 of file sys_pipe.c.

Referenced by pipeinit().

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pipeclose()

static void pipeclose ( struct pipe *  cpipe )

static

Definition at line 1647 of file sys_pipe.c.

References knlist_destroy(), pipe_free_kmem(), pipe_zone, pipelock(), pipeselwakeup(), pipeunlock(), seldrain(), and wakeup().

Referenced by kern_pipe(), and pipe_dtor().

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pipeinit()

static void pipeinit ( void *dummy  __unused )

static

Definition at line 255 of file sys_pipe.c.

References pipe_zone, pipe_zone_ctor(), pipe_zone_fini(), pipe_zone_init(), pipedev_ino, and pipeino_unr.

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pipelock()

static __inline int pipelock ( struct pipe *  cpipe, int  catch  )

static

Definition at line 640 of file sys_pipe.c.

Referenced by pipe_direct_write(), pipe_read(), pipe_write(), and pipeclose().

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pipeselwakeup()

void pipeselwakeup

(

struct pipe *

cpipe

)

Definition at line 684 of file sys_pipe.c.

References pgsigio(), and selwakeuppri().

Referenced by pipe_direct_write(), pipe_read(), pipe_write(), and pipeclose().

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pipespace()

static int pipespace ( struct pipe *  cpipe, int  size  )

static

Definition at line 628 of file sys_pipe.c.

References pipespace_new().

Referenced by pipe_read(), and pipe_write().

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pipespace_new()

static int pipespace_new ( struct pipe *  cpipe, int  size  )

static

Definition at line 563 of file sys_pipe.c.

References amountpipekva, pipe_free_kmem(), pipeallocfail, pipefragretry, piperesizefail, ppsratecheck(), and printf().

Referenced by pipe_create(), and pipespace().

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pipeunlock()

static __inline void pipeunlock ( struct pipe *  cpipe )

static

Definition at line 668 of file sys_pipe.c.

References wakeup_one().

Referenced by pipe_direct_write(), pipe_read(), pipe_write(), and pipeclose().

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sys_pipe2()

int sys_pipe2	(	struct thread *	td,
		struct pipe2_args *	uap
	)

Definition at line 539 of file sys_pipe.c.

References kern_close(), and kern_pipe().

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sysctl_handle_pipe_mindirect()

static int sysctl_handle_pipe_mindirect ( SYSCTL_HANDLER_ARGS  )

static

Definition at line 268 of file sys_pipe.c.

References pipe_mindirect, and sysctl_handle_long().

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SYSCTL_INT() [1/4]

SYSCTL_INT	(	_kern_ipc	,
		OID_AUTO	,
		pipeallocfail	,
		CTLFLAG_RD	,
		&	pipeallocfail,
		0	,
		"Pipe allocation failures"
	)

SYSCTL_INT() [2/4]

SYSCTL_INT	(	_kern_ipc	,
		OID_AUTO	,
		pipefragretry	,
		CTLFLAG_RD	,
		&	pipefragretry,
		0	,
		"Pipe allocation retries due to fragmentation"
	)

SYSCTL_INT() [3/4]

SYSCTL_INT	(	_kern_ipc	,
		OID_AUTO	,
		piperesizeallowed	,
		CTLFLAG_RW	,
		&	piperesizeallowed,
		0	,
		"Pipe resizing allowed"
	)

SYSCTL_INT() [4/4]

SYSCTL_INT	(	_kern_ipc	,
		OID_AUTO	,
		piperesizefail	,
		CTLFLAG_RD	,
		&	piperesizefail,
		0	,
		"Pipe resize failures"
	)

SYSCTL_LONG() [1/2]

SYSCTL_LONG	(	_kern_ipc	,
		OID_AUTO	,
		maxpipekva	,
		CTLFLAG_RDTUN|	CTLFLAG_NOFETCH,
		&	maxpipekva,
		0	,
		"Pipe KVA limit"
	)

SYSCTL_LONG() [2/2]

SYSCTL_LONG	(	_kern_ipc	,
		OID_AUTO	,
		pipekva	,
		CTLFLAG_RD	,
		&	amountpipekva,
		0	,
		"Pipe KVA usage"
	)

SYSCTL_OID()

SYSCTL_OID	(	_kern_ipc	,
		OID_AUTO	,
		pipe_mindirect	,
		CTLTYPE_LONG|	CTLFLAG_RW,
		&	pipe_mindirect,
		0	,
		sysctl_handle_pipe_mindirect	,
		"L"	,
		"Minimum write size triggering VM optimization"
	)

SYSINIT()

SYSINIT	(	vfs	,
		SI_SUB_VFS	,
		SI_ORDER_ANY	,
		pipeinit	,
		NULL
	)

Variable Documentation

amountpipekva

long amountpipekva

static

Definition at line 207 of file sys_pipe.c.

Referenced by pipe_create(), pipe_free_kmem(), pipe_read(), pipe_write(), and pipespace_new().

pipe_chmod

fo_chmod_t pipe_chmod

static

Definition at line 156 of file sys_pipe.c.

pipe_chown

fo_chown_t pipe_chown

static

Definition at line 157 of file sys_pipe.c.

pipe_close

fo_close_t pipe_close

static

Definition at line 155 of file sys_pipe.c.

pipe_fill_kinfo

fo_fill_kinfo_t pipe_fill_kinfo

static

Definition at line 158 of file sys_pipe.c.

pipe_ioctl

fo_ioctl_t pipe_ioctl

static

Definition at line 151 of file sys_pipe.c.

pipe_kqfilter

fo_kqfilter_t pipe_kqfilter

static

Definition at line 153 of file sys_pipe.c.

pipe_mindirect

long pipe_mindirect = PIPE_MINDIRECT

static

Definition at line 212 of file sys_pipe.c.

Referenced by pipe_write(), and sysctl_handle_pipe_mindirect().

pipe_nfiltops

struct filterops pipe_nfiltops

static

Initial value:

= {
        .f_isfd = 1,
        .f_detach = filt_pipedetach_notsup,
        .f_event = filt_pipenotsup
}

Definition at line 182 of file sys_pipe.c.

Referenced by pipe_kqfilter().

pipe_poll

fo_poll_t pipe_poll

static

Definition at line 152 of file sys_pipe.c.

pipe_read

fo_rdwr_t pipe_read

static

Definition at line 148 of file sys_pipe.c.

pipe_rfiltops

struct filterops pipe_rfiltops

static

Initial value:

= {
        .f_isfd = 1,
        .f_detach = filt_pipedetach,
        .f_event = filt_piperead
}

Definition at line 187 of file sys_pipe.c.

Referenced by pipe_kqfilter().

pipe_stat

fo_stat_t pipe_stat

static

Definition at line 154 of file sys_pipe.c.

pipe_truncate

fo_truncate_t pipe_truncate

static

Definition at line 150 of file sys_pipe.c.

pipe_wfiltops

struct filterops pipe_wfiltops

static

Initial value:

= {
        .f_isfd = 1,
        .f_detach = filt_pipedetach,
        .f_event = filt_pipewrite
}

Definition at line 192 of file sys_pipe.c.

Referenced by pipe_kqfilter().

pipe_write

fo_rdwr_t pipe_write

static

Definition at line 149 of file sys_pipe.c.

pipe_zone

uma_zone_t pipe_zone

static

Definition at line 248 of file sys_pipe.c.

Referenced by pipe_paircreate(), pipeclose(), and pipeinit().

pipeallocfail

int pipeallocfail

static

Definition at line 209 of file sys_pipe.c.

Referenced by pipespace_new().

pipedev_ino

dev_t pipedev_ino

static

Definition at line 250 of file sys_pipe.c.

Referenced by pipe_stat(), and pipeinit().

pipefragretry

int pipefragretry

static

Definition at line 208 of file sys_pipe.c.

Referenced by pipespace_new().

pipeino_unr

struct unrhdr64 pipeino_unr

static

Definition at line 249 of file sys_pipe.c.

Referenced by pipe_create(), and pipeinit().

pipeops

struct fileops pipeops

Initial value:

= {
        .fo_read = pipe_read,
        .fo_write = pipe_write,
        .fo_truncate = pipe_truncate,
        .fo_ioctl = pipe_ioctl,
        .fo_poll = pipe_poll,
        .fo_kqfilter = pipe_kqfilter,
        .fo_stat = pipe_stat,
        .fo_close = pipe_close,
        .fo_chmod = pipe_chmod,
        .fo_chown = pipe_chown,
        .fo_sendfile = invfo_sendfile,
        .fo_fill_kinfo = pipe_fill_kinfo,
        .fo_flags = DFLAG_PASSABLE
}

Definition at line 160 of file sys_pipe.c.

Referenced by kern_pipe().

piperesizeallowed

int piperesizeallowed = 1

static

Definition at line 211 of file sys_pipe.c.

Referenced by pipe_read(), and pipe_write().

piperesizefail

int piperesizefail

static

Definition at line 210 of file sys_pipe.c.

Referenced by pipespace_new().